History of phreaking
The precise origins of phone phreaking are unknown, although it is believed[who?] that phreak-like experimentation began with widespread deployment of automatic switches on the telephone networks. In the United States, AT&T began introducing automatic switches for long distance and certain forms of trunking carriers in the mid-to-late 1950s. With the introduction of these switches, the general population began, for the first time, to interact with computing power on a large scale.